33.4.5 Burst Average Mode
The Burst Average mode (MD = 
    ‘b011) acts the same as the
                        Average mode in most respects. The one way it differs is that it
                        continuously retriggers ADC sampling until the CNT value is equal to RPT, even if Continuous Sampling mode (see
                                Continuous Sampling Mode) is not enabled. This provides a
                        threshold comparison on the average of a short burst of ADC samples.